https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105832
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Dead Code Elimination |[13 Regression] Dead Code
|Regression at -O3 (trunk |Elimination Regression at
|vs. 12.1.0) |-O3 (trunk vs. 12.1.0)
Last reconfirmed| |2022-06-13
CC| |rguenth at gcc dot gnu.org
Target Milestone|--- |13.0
Keywords| |missed-optimization
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. GCC 12:
t.c:12:23: optimized: Unswitching loop on condition: if (iftmp.0_9 <= 1)
t.c:12:23: optimized: Unswitching loop on condition: if (iftmp.0_9 == 1)
t.c:12:23: optimized: Unswitching loop on condition: if (iftmp.1_10 != 0)
t.c:12:23: optimized: Unswitching loop on condition: if (iftmp.1_10 != 0)
and trunk:
t.c:12:23: optimized: unswitching loop 1 on ‘if’ with condition: iftmp.0_9 <= 1
t.c:12:23: optimized: unswitching loop 1 on ‘if’ with condition: iftmp.1_10 !=
0
t.c:12:23: optimized: unswitching loop 1 on ‘if’ with condition: iftmp.0_9 == 1
somehow trunk doesn't consider the 2nd iftmp.1_10 != 0 condition.
